
    Ŀ
     אַ 㯠  ⨳
      אַ 㯠   (DMA)
砥  ࣠樨 । ᨢ    
ன⢮ -뢮 (஬).   ⮬ । 
ந  ࠢ ᯥ樠쭮 㤮 (㤥 뢠 
⥬ DMA) ᨬ  ᨭ஭  ⭮襭  ய.
ய ⢥⢥   ।⥫ ன
(ணࠬ஢) 㤮 DMA  । ⨯ ।, 
砫쭮   ࠧ ᨢ   .  ணࠬ஢
। DMA 樨   DRQ  ॠ ⥬ DMA
ࠫ쭮  믮 ய஬ ᢮ ணࠬ.
    ⥬ DMA ᯥ稢 ६ ᥬ ᨬ
ணࠬ㥬 । DMA,   ⥬ 設 ᮣ᭮
 ਮ⠬.   0, 1, 2  3 ন  
8-ࠧ來묨 ன⢠  ।    ⭮.   5, 6 
7 㦨 16-ࠧ來 ன⢠       2 .
 4 ⢮  裡  ஫஢ DMA, 室 
⥬ DMA.
     ⥬ 設   ஫ DMA ᮮ⢥ 
ᨣ:  DRQ -   ।, DACK - ⢥ত ।.  
 ᨣ ⥬ 設 ⭮  ⥬ DMA -  /. /
㦤  DMA  襭 襭 ।.  
/ -    ,  䨪 ந  ⨢
DACK  ६ ⨢樨 /.
    । ᨢ    ⮨  ᫥⥫쭮
⠪ 뢠 横 DMA.   DMA  ।   
ன⢮ -뢮 ।⠢ ᮡ  ६
믮 設  饭   (-MEMR  -MEMW)  
饭   (-IOW  -IOR, ᮮ⢥⢥),  ६ ண 
設  ⨢  .  ⨢   横 DMA ।
ᢥ ࠧ  樨 ⨢ ᨣ DRQ  -DACK.
஢  ᨣ -IOW  -IOR  横 DMA  ⮫쪮  ,
 맢 ⨢ ᨣ DRQ  稫 ⢥ত  
ᮮ⢥饣 ᨣ -DACK.
    ᫥ ⮣     ணࠬ஢  室
। (ணࠬ஢  ஫ DMA  ॣ  ࠭
DMA), ᪠ ன⢮ -뢮, 祭  ⮬ .  
⮣  㦨  砥 ⥬ DMA, 
ய    祬- 㣨.   ன⢮
⠭ ⮢  ,  뤠   㦨 DRQ (.
5.13).	᫨       ᪨஢, ⥬ DMA
뤠   墠 設  ய HRQDMA,  㯠
 奬 ࡨࠦ.   HRQDMA 䨪  ਣ 
⥫쭮 ஭ ᨣ DMACLK ( ⫨稥   
ॣ).  ᫨     㦥  
ॣ, 奬 ࡨࠦ 뤠   ய.


	     	SI   	S0   	S1   	S2   	S3   	SW   	S4   	SI   
DMACLK	 ͻ	 ͻ	 ͻ	 ͻ	 ͻ	 ͻ	 ͻ	 ͻ	 ͻ
	    ͼ   ͼ   ͼ   ͼ   ͼ   ͼ   ͼ   ͼ   
DRQ	   ػ  	     	    	 
	 ͼ	 		    	 
	 t1		      t2	 t3    	     	 
		t4 	    	    	 	 	t4
HRQDMA		    ͻ 	 
	 ͼ		    	    			  
				       	 	    		 
HOLDA			   ͻ
	  ͼ	       	 	    		  
				 t5   			 t5
-DACK	  ͻ	 	    	       
				      ͼ
				       	 	    	        
SAEN			    ͻ
	  ͼ	       	 	    		   
				     t6		      t6 
-MEMRDMA  ͻ	 	    	    
 (-IOR) 			 	   ͼ  
				            t6	    	t7  
-IOW	  ͻ		   
 (-MEMW)			            	    ͼ    
				 	   t8		  t9
-MEMR	  ͻ 	    	   
				 	     ͼ  
			     t10  t11	    	 	 
ADSTB				  ͻ			       
	  ͼ	   
				  ________			       
XD0-XD7   (__________)
(ࠧ  		      			           
DMA 8-15)			      		    	    t13
			     t12___________________________________
SA0-SA7   (______________________________________)
(SA1-SA8)			       		    	      
			       t14_____________________________________
SA8-SA15  (________________________________________)
(SA9-SA16)			       		    	       
				   t15__________________________t16
SA16-SA19 (________________________________)
(LA17-LA23)						    	 
						     t17	t17
TC							   ͻ
	  ͼ	   
							     
I/O CH RDY 
							 
						     t18

    . 5.13. ६ ࠬ 横 DMA

     ய ⮢ ᢮ 設,  ⢥ত  
墠 設 ᨣ HOLDA,  設 㯠  ᯮ殮 ⥬
DMA.  ᫥ ⮣ 믮 ⢨  뤠  祩 , 
ன 㤥 믮    ஫ DMA. 
ନ   ⮢, 祬  8-  16-ࠧ來  
  ⮦⢥.  ⮢  㫥 ࠧ  
 ணࠬ஢    横  横,   塠⮢ - 
 ணࠬ,  ॢ ਭ㤨⥫쭮  㫥 祭  ६
横 DMA.   ࠧ,      0, 1, 2  3
⮨  ࠧ冷 SA0-SA7,    5, 6  7 -  ࠧ冷 SA1-SA8.
।     0, 1, 2  3 ନ  ࠧ冷
SA8-SA15,    5, 6  7 -  ࠧ冷 SA9-SA16.   
   0, 1, 2  3 ⮨  ࠧ冷 SA16, LA17-LA23,  
 5, 6  7 -  ࠧ冷 LA17-LA23 (ᮮ⢥騥 ࠧ  設
LA ।  ࠧ SA17-SA19).
       ।⢥ 㯠 १ ࠧ 設
, ।  १ 設 XD  ᨣ ADSTB  
ॣ      設 ,   ନ 
室 ॣ ࠭ DMA  ⨢ ᨣ -DACK.   -SBHE 
 0, 1, 2  3 ।   ࠧ鸞  SA0,  
 5, 6  7 ᥣ ࠢ .
    ᫥ ⮣  ନ஢ , 稭 䠧 뤠 .  
 横 DMA      :  ⥭   
        ⥭  .    
뤠  ⠪   ⮣, ⮡  設  
⢨⥫ .	 砫 믮  -MEMR ⠪
⪫뢠   ⠪.   室  ⮣, ⮡
।।  ⠭ থ  ࠪ    ஭
 ࠪ  -MEMR  㣮 ஭,  ஬ ।⠭ 
 㤥 筮  ⭮襭  .
    筮  横 DMA  1 ⠪ ,   室
  横   ᨣ I/O CH RDY.   ⮬ 
ॢ ᨣ  ﭨ " ⮢" ᮮ⢥ ⮭  
.  5.13.
    ᫨ 믮塞 横 DMA  ᫥  横 । ᨢ,
⥬ DMA ⨢ ᨣ /.
     ⠡.  5.2 ਢ ࠬ ६ ࠬ,  
.  5.13.   ࠬ  ࠢ ࠪ   ⭮
ࠧ   ⫨.

	      . 5.2. ६ ࠬ 横 DMA
Ŀ
	 						   祭, 
ࠬ   ࠬ			  Ĵ
	 						  .. 
Ĵ
   t1	  ६ ।⠭ DRQ ⭮⥫쭮 ஭	    0	   -	
	  DMACLK  ⨢樨			  	 	
Ĵ
   t2	  ६ 㤥ঠ DRQ ⭮⥫쭮 ஭ -DACK    0	   -	
Ĵ
   t3	  ६ ।⠭ DRQ ⭮⥫쭮 ஭	    0	   -	
	  DMACLK  ⨨				  	 	
Ĵ
   t4	  প HRQDMA ⭮⥫쭮 ஭ DMACLK	    -	  120	
Ĵ
   t5	  প -DACK  ⭮⥫쭮 ஭ DMACLK	    -	  170	
Ĵ
   t6	  প ஭⮢  DMA  ⨢樨	    -	  190	
	  ⭮⥫쭮 ஭ DMACLK			  	 	
Ĵ
   t7	  প ஭⮢  DMA  ⨨	    -	  130	
	  ⭮⥫쭮 ஭ DMACLK			  	 	
Ĵ
   t8	  প ஭  -MEMR ⭮⥫쭮	    8	   20	
	  ஭ DMACLK				  	 	
Ĵ
   t9	  প ஭  -MEMR ⭮⥫쭮	    3	   10	
	  ஭ -MEMRDMA				  	 	
Ĵ
   t10   প ⥫쭮 ஭ ADSTB 	    -	  130	
Ĵ
   t11   প ⥫쭮 ஭ ADSTB 	    -	   90	
Ĵ
   t12   প 뤠 襩   	    -	  190	
Ĵ
   t13   ६ 㤥ঠ 襩   	    -	   85	
Ĵ
   t14   প 뤠 ।   	    -	   15	
Ĵ
   t15   প 뤠 襩   	    -	   45	
Ĵ
   t16   ६ 㤥ঠ 襩   	    20     -	
Ĵ
   t17   প ஭ /				    -	  170	
Ĵ
   t18   ६ ।⠭ ᨣ I/O CH RDY ⭮-   80     -	
	  ⥫쭮 ஭ DMACLK 			  	 	


